A gantry crane transports a shipping container from the Maersk Madrid cargo ship,...A gantry crane transports a shipping container from the Maersk Madrid cargo ship, operated by A.P. Moller-Maersk A/S, at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how long the boost will continue as the country gets closer to withdrawing from the European Union. Photographer: Simon Dawson/Bloomberg via Getty ImagesLessMore

The Maersk Madrid container ship, operated by A.P. Moller-Maersk A/S, sits docked...The Maersk Madrid container ship, operated by A.P. Moller-Maersk A/S, sits docked during cargo unloading at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how long the boost will continue as the country gets closer to withdrawing from the European Union. Photographer: Simon Dawson/Bloomberg via Getty ImagesLessMore

A man casts a fishing rod as the Maersk Madrid container ship, operated by A.P....A man casts a fishing rod as the Maersk Madrid container ship, operated by A.P. Moller-Maersk A/S, sits docked at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how long the boost will continue as the country gets closer to withdrawing from the European Union. Photographer: Simon Dawson/Bloomberg via Getty ImagesLessMore

The Maersk Madrid container ship, operated by A.P. Moller-Maersk A/S, sits docked...The Maersk Madrid container ship, operated by A.P. Moller-Maersk A/S, sits docked as its cargo is unloaded at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how long the boost will continue as the country gets closer to withdrawing from the European Union. Photographer: Simon Dawson/Bloomberg via Getty ImagesLessMore

A lorry driver waits to load cargo as shipping containers, bearing the A.P....A lorry driver waits to load cargo as shipping containers, bearing the A.P. Moller-Maersk A/S logo, sit beyond at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how long the boost will continue as the country gets closer to withdrawing from the European Union. Photographer: Simon Dawson/Bloomberg via Getty ImagesLessMore

General Operations At Port Of Felixstowe Ltd. As U.K. Exporters Not Sure How Long Exchange-Rate Boost Will Last

Freight trains stand at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how...More

Freight trains stand at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison...Freight trains stand at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how long the boost will continue as the country gets closer to withdrawing from the European Union. Photographer: Simon Dawson/Bloomberg via Getty ImagesLessMore

General Operations At Port Of Felixstowe Ltd. As U.K. Exporters Not Sure How Long Exchange-Rate Boost Will Last

People sit on the shoreline as the Maersk Madrid container ship, operated by A.P. Moller-Maersk A/S, sits docked at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017....More

People sit on the shoreline as the Maersk Madrid container ship, operated by A.P....People sit on the shoreline as the Maersk Madrid container ship, operated by A.P. Moller-Maersk A/S, sits docked at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how long the boost will continue as the country gets closer to withdrawing from the European Union. Photographer: Simon Dawson/Bloomberg via Getty ImagesLessMore

General Operations At Port Of Felixstowe Ltd. As U.K. Exporters Not Sure How Long Exchange-Rate Boost Will Last

Shipping containers are moved at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not...More

Shipping containers are moved at the Port of Felixstowe Ltd., a subsidiary of CK...Shipping containers are moved at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how long the boost will continue as the country gets closer to withdrawing from the European Union. Photographer: Simon Dawson/Bloomberg via Getty ImagesLessMore

General Operations At Port Of Felixstowe Ltd. As U.K. Exporters Not Sure How Long Exchange-Rate Boost Will Last

Freight trains await cargo loading at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're...More

Freight trains await cargo loading at the Port of Felixstowe Ltd., a subsidiary of...Freight trains await cargo loading at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how long the boost will continue as the country gets closer to withdrawing from the European Union. Photographer: Simon Dawson/Bloomberg via Getty ImagesLessMore

A truck moves past shipping containers, bearing the A.P. Moller-Maersk A/S logo, at...A truck moves past shipping containers, bearing the A.P. Moller-Maersk A/S logo, at the Port of Felixstowe Ltd., a subsidiary of CK Hutchison Holdings Ltd. in Felixstowe, U.K., on Tuesday, Aug. 22, 2017. U.K. exporters are still reaping the benefits of a weaker pound, but they're not sure how long the boost will continue as the country gets closer to withdrawing from the European Union. Photographer: Simon Dawson/Bloomberg via Getty ImagesLessMore